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Dynamic characteristics analysis of high speed rolling bearing rotor system

Zhang Qiang, Li Zishun (School of mechanical engineering Liaoning Technical University, Liaoning Fuxin 123000) relationship between the bearing stiffness change and bearing damping value of rolling angle rolling, and the change in amplitude and speed; and the dynamic characteristics of the rotor bearing system is analyzed, influence the change of damping coefficient on dynamic characteristics of bearing rotor system. The analysis shows that the larger the speed is, the shorter the change period of stiffness and damping value is, and the dynamic characteristics of bearing rotor system decrease with the increase of damping.

0 lead rolling bearing is one of the widely used parts in modern rotary machinery, which mainly relies on rolling contact between components to support rotation. With the development of rolling bearing research, the elastohydrodynamic lubrication of point contact of rolling bearing has aroused great interest of scholars and engineers. The results show that the lubrication of oil film with elastic fluid can be realized under certain operating conditions by the mechanical parts with point and line contact. The surface damage of the bearing is closely related to the lubrication state. The shape of lubricant film, the thickness of oil film, the pressure distribution in the oil film, the temperature field and the friction force all directly affect the formation and development of the failure situation.

When the machine runs, the rolling bearing rotor system often vibrates. Under different working conditions, the lubrication state of the rolling bearing will lead to the change of the stiffness damping of the bearing, and the stiffness damping of the rolling bearing is an important factor affecting the dynamic characteristics of the bearing rotor system.

Most of the research on the dynamic characteristics of the rolling bearing rotor system is based on the linear dynamics theory, and the stability and amplitude frequency characteristics of the bearing rotor system are studied. But many nonlinear factors (such as oil film reaction, radial clearance, etc.) exist in rotating mechanical systems, which lead to many nonlinear dynamic phenomena (such as bifurcation, chaos and jump).

Therefore, it is necessary to study the influence of the stiffness damping on the nonlinear dynamic characteristics of the rolling bearing rotor system under lubrication condition.

When the steel ball and the inner and outer rings of the bearing are in contact at the same time, two contact points are formed at both ends of the steel ball in the direction of the diameter. Each contact pair is male, Liaoning Xiuyan people, doctor, Professor, mainly engaged in the structural design and reliability analysis of the mining machinery.

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